Tachometer should be in the dash pod on the right side instead of the fuel gage, at least for a '69.
Also, engine compartment wiring is different. For a car with factory gages, both the engine harness and the front light wiring harnesses are different than cars without factory gages. Cars with gages have the tach lead built into the engine harness, and the ammeter leads built into the front light harness.
Non gage cars would have the fuel line going to the dash, instead of to the console for car with gages. For non gage cars, the engine temp lead would also have gone to the dash idiiot light instead of down to the console where it would go for cars with gages.
Parts readily available in the aftermarket to make this a fairly transparent conversion. You can buy the required console extension harness and new engine and front light harnesses (for cars with gages) for under the hood.